12/3 Wire - Multiple Circuits - Correct Beaker


  #1  
Old 04-28-20, 04:27 PM
M
Member
Thread Starter
Join Date: Aug 2007
Posts: 4
Upvotes: 0
Received 0 Upvotes on 0 Posts
12/3 Wire - Multiple Circuits - Correct Beaker

Hello,
I have a 12/3 wire that terminates at a junction box. In that box I have the red lead powering a small group of outlets (using 12/2 wire) and the black lead is powering a single ceiling light (using 14/2 wire). I have been reading about the dangers of incorrectly wiring the 12/3 wire at the box and wanted to ask a few questions.

1. If the red lead and black lead are connected to separate single pole breakers and on different poles of the panel, does this meet code?

2. If the red lead and black lead are connected to separate tandem breakers and on different poles of the panel, does this meet code?

3. Is the only manner in which to meet code when wiring two circuits with one 12/3 wire to connect it to a 20amp two pole breaker?

Thanks
 
  #2  
Old 04-28-20, 04:31 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,100
Received 3,982 Upvotes on 3,574 Posts
Current code dictates that a MWBC using 12-3 must connect to a two pole 20A breaker.
This is done so that both legs of power/circuits are turned off to eliminate an open neutral hazard.
Also..... if the circuit is protected at 20A..... you can only use #12 wiring.
No intermingling of #12 and #14 is allowed.
 
  #3  
Old 05-03-20, 05:38 PM
M
Member
Thread Starter
Join Date: Aug 2007
Posts: 4
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thank you PJmax for the clarification as well as the info about the 14 gauge wire.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: